28321002 has 20 divisors (see below), whose sum is σ = 63460386. Its totient is φ = 9440280.

The previous prime is 28320979. The next prime is 28321061. The reversal of 28321002 is 20012382.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 28291761 + 29241 = 5319^2 + 171^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 87249 + ... + 87572.

Almost surely, 2^28321002 is an apocalyptic number.

28321002 is an abundant number, since it is smaller than the sum of its proper divisors (35139384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28321002 is a wasteful number, since it uses less digits than its factorization.

28321002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174835 (or 174826 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 28321002 is about 5321.7480210923. The cubic root of 28321002 is about 304.8149087506.

Adding to 28321002 its reverse (20012382), we get a palindrome (48333384).

The spelling of 28321002 in words is "twenty-eight million, three hundred twenty-one thousand, two".